JP3481549B2 - Line allocation method for mobile communication system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line allocation method for a mobile communication system. 2. Description of the Related Art Generally, a mobile communication system comprises a mobile station, a radio base station, and an exchange. The mobile station and the radio base station are connected by a radio line, and are connected to the radio base station. The exchanges are connected by a transmission line, and voice data or non-voice data is transmitted over the radio line and the transmission line. FIG. 8 is a diagram showing the configuration of one frame (transmission time 125 μs) transmitted on the transmission path between the radio base station and the exchange. FIG.
In this example, each data constituting one frame is time-division multiplexed and transmitted using 32 time slots T1 to T32. Here, in FIG. 8, the time slot T
1 to T6 are used as voice lines for transmitting voice signals (voice data), and the time slots T7 and T8 are used as non-voice lines for transmitting non-voice signals (that is, non-voice data). If it is assumed that 12 wireless devices 10 to 21 each having 3 wireless channels are provided in a wireless base station, conventionally, 3 wireless channels of the wireless device 10 are connected to the voice line T1. And three wireless channels of the wireless device 11 are allocated. Similarly, each voice line T2
A voice call of each channel of each of the wireless devices 12 to 21 is allocated to T6, and voice data is transmitted. Further, the non-voice lines T7 and T8 are assigned a non-voice call generated in an arbitrary channel of the wireless devices 10 to 21, and
At 7,8, non-voice calls for a total of 6 channels can be transmitted simultaneously. Note that other time slots such as the time slot T32 shown in FIG. 8 are allocated to another wireless device of this wireless base station or a wireless device of another wireless base station. However, in a conventional mobile communication system, a voice line or a non-voice line on a transmission path between a radio base station and an exchange is fixed to each radio device of the radio base station. Has the following problems. That is, when non-voice data is communicated between the radio base station and the exchange and the non-voice line is full, even if the voice line is free, new non-voice data cannot be communicated even if the voice line is free. When voice data is communicated between the mobile station and the switching center and the voice line is full, new voice data cannot be transmitted even if the non-voice line is free. There is a problem that the use efficiency of the device is reduced. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the efficiency of using the transmission line when communicating voice and non-voice data on the transmission line between the radio base station and the exchange. SUMMARY OF THE INVENTION In order to solve such a problem, the present invention provides a mobile station, a radio base station having a plurality of radio apparatuses for performing radio communication with the mobile station, and a radio base station. In a mobile communication system comprising a switching center connected via a transmission path and connected to the mobile station and converted into data used in a fixed network when data transmitted through the transmission path is input by a wireless device, one frame on the transmission path , And divides the data into data of a plurality of time slots for communication, and divides the plurality of time slots into voice lines capable of communicating voice data, non-voice lines capable of communicating non-voice data, and voice data. And non-voice data that can be transmitted to any one of the voice / non-voice dual-purpose lines, and the allocated voice / non-voice circuit. A line and a voice / non-voice line are respectively allocated to the wireless devices of the radio base station, and the voice / non-voice line is switched to voice data communication or non-voice data in accordance with the respective traffic volumes of voice data and non-voice data. This is used for any one of communication. Hereinafter, the present invention will be described with reference to the drawings. FIG. 1A is a block diagram showing a configuration of a mobile communication system to which the present invention is applied. This mobile communication system includes a mobile station 5 as shown in FIG.
, A wireless base station 1, an exchange 3, and a fixed network 7. The wireless base station 1 includes a plurality of wireless devices 10 to 21 and a control unit 22, and the exchange 3 includes a plurality of voice processing devices 30 to 36 and a control unit 37. The wireless base station 1 and the exchange 3 are connected by a transmission path a, and a voice signal or a non-voice signal is transmitted and received between the wireless base station 1 and the exchange 3 via the transmission path a. Each of the wireless devices 10 to 21 in the wireless base station 1
Receives uplink wireless data transmitted from the mobile station 5 via the antenna AT, demodulates the wireless data, and transmits the demodulated data to the switching station 3 via the transmission path a under the control of the control unit 22. The data is transmitted to each of the audio processing devices 30 to 36. Demodulated data from the wireless devices 10 to 21 of the exchange 3 are received by the voice processing devices 30 to 36 under the control of the control unit 37, and the received demodulated data is converted into data for the fixed network 7 and output to the fixed network 7. . When the voice processing devices 30 to 36 of the exchange 3 receive the data from the fixed network 7, they convert the received data, and control each of the wireless devices of the wireless base station 1 via the transmission path a under the control of the control unit 37. Send to 10-21. The wireless devices 10 to 21 of the wireless base station 1
When the data from the audio processing devices 30 to 36 is received,
This received data is modulated into wireless data and transmitted to the mobile station 5 as downlink wireless data. FIG. 1B shows the wireless device 1 shown in FIG.
FIG. 2 is a block diagram illustrating a configuration of the audio processing apparatus and an audio processing apparatus. The wireless device 10 includes a wireless device 20A that transmits and receives wireless data, and a DSP (digital
A signal processor 20B and a demultiplexing circuit 20C for multiplexing and demultiplexing a signal transmitted on the transmission line a are provided. The other wireless devices 11 to 21 have the same configuration. The audio processing device 30 includes a DSP 30A that controls the audio processing device 10 and a demultiplexing circuit 3 that performs multiplexing and demultiplexing of a signal transmitted on the transmission line a.
A multiplexing / demultiplexing circuit 30C for multiplexing and demultiplexing signals transmitted on a transmission path between the fixed network 0B and the fixed network 7 is provided. The other audio processing devices 31 to 36 have the same configuration. FIG. 2 is a diagram showing a first configuration of a frame subjected to time division multiplex communication on the transmission line a in FIG. Transmission line a
As shown in FIG. 2, one frame of data is repeatedly transmitted every 125 μs. This transmission line a is
This is a transmission line having a transmission speed of 2 Mbps, in which data of one frame is divided into 32 time slots from time slot T1 to time slot T32 and transmitted. The frame data transmitted in one time slot on the transmission line a is 8 bits, and the transmission rate per time slot is 64 Kbps. Here, the example of FIG.
T5 is used as a voice line, time slot T6 is used as a voice / non-voice line, and time slot T7 is used as a non-voice line. Each of the wireless devices 10 to 21 in the wireless base station 1 shown in FIG. 1 has three wireless channels. Here, in the example of FIG. 2, the wireless device 10 in the wireless base station 1 is connected to the voice line T1.
11 in the voice line T1,
Are transmitted in total for six channels. Similarly, the wireless devices 12 to 19 are allocated to the voice lines T2 to T5 such that the voice data of the wireless devices 12 to 19 in the wireless base station 1 are transmitted. The voice / non-voice line T6 is allocated so that voice data or non-voice data of the radio devices 20 and 21 in the radio base station 1 is transmitted. Further, the non-voice line T7 is allocated so that the non-voice data of the wireless device 21 is transmitted. It should be noted that other time slots such as the time slot T32 shown in FIG. 2 are allocated to another wireless device (not shown) of this wireless base station or a wireless device of another wireless base station. FIG. 3 is a diagram showing the format of the audio lines T1 to T5 in FIG. Here, when audio data of one audio line (for example, audio line T1) in which one frame is repeatedly transmitted at a time of 125 μs is collected for a time of 20 ms, as shown in FIG.
Of the six channels. In one audio line, transmission of audio data based on this format is repeated every 20 ms. Since one wireless device in the wireless base station 1 can process data for three channels as described above, one voice line on the transmission line a can be used by two wireless devices in the wireless base station 1. become. FIG. 4 is a diagram showing a format of the non-voice line T7 shown in FIG. When data of one non-voice line repeated at a time of 125 μs is collected for a time of 20 ms, non-voice data of three channels CH0 to CH2 is obtained as shown in FIG. Non-voice line is this 20m
The transmission of non-voice data based on this format is repeated every s. Here, non-voice data is compared to voice data,
Since the amount of communication data on the transmission path is large, one non-voice line 7 transmits non-voice data of three channels CH0 to CH2. Since a wireless channel allocated to one wireless device communicating with the mobile station can transmit data on three channels regardless of voice data and non-voice data, one wireless device uses one non-voice line. Will be done. Therefore, when two wireless devices 20 and 21 perform non-voice communication, this embodiment uses two lines, a non-voice line T7 and a combined voice / non-voice line T6. Since the line T6 is a voice / non-voice line, the format of the voice line shown in FIG. 3 or the non-voice line shown in FIG. Next, FIG. 5 is a flowchart showing a first operation example of the mobile communication system shown in FIG. The operation of the main part of the mobile communication system will be described with reference to this flowchart and the frame configuration shown in FIGS. In step S1 of FIG. 5, the control unit 22 of the wireless base station 1 determines whether or not there is a request for non-voice communication from the mobile station 5 via any of the idle wireless devices. Here, if there is a request for non-voice communication and the determination in step S1 is “Y”, the control unit 22
First determines in step S2 whether there is an empty channel in the wireless device 21 assigned for non-voice calls. If there is an empty channel in the wireless device 21 and the determination in step S2 becomes "Y", the control unit 22 assigns the non-voice line T7 on the transmission line a to the wireless device 21 in step S3. The communication of the non-voice data is started via the vacant channel and the non-voice line T7 on the transmission line a. Here, when the channels of the wireless device 21 are vacant for a maximum of three channels, “Y” of “Is there a non-voice call request?” Of step S1 and “wireless device 21” of step S2.
Is there room? , A non-voice call for up to three channels is assigned to the wireless device 21 and the non-voice line T7. The wireless device 21 and the non-voice line T7
When the wireless base station 1 requests a non-voice call for the fourth channel during communication of non-voice data for three channels via the control unit 22, the control unit 22 determines whether there is a "non-voice call request?" In response to "Y" and "N" of "is wireless device 21 empty?" In step S2, wireless device 20 is assigned to voice / non-voice shared line T6 in step S4. As a result, communication of non-voice data is started via the vacant channel of the wireless device 20 and the voice / non-voice combined line T6 on the transmission path a. Note that the control unit 22 includes the radio units 20 and 21
If no non-voice call is assigned to
0, 21 is used for the voice / non-voice shared line T6 to perform voice communication. Therefore, the voice / non-voice combined line T6
Can be used as a voice or non-voice line depending on the traffic of voice and non-voice calls. When a mobile station requests a voice call, the control unit 22 of the wireless base station 1 sequentially allocates the wireless devices 10 to the wireless base station 19 sequentially from the wireless device 10 to the voice lines T1 to T5 as described above. . As described above, the non-voice call is preferentially assigned to the wireless devices 20 and 21 and the wireless devices 20 and 21 are assigned to the wireless devices 20 and 21 in FIG.
The voice / non-voice combined line T6 and the non-voice line T7 in the middle are allocated and used. As a result,
When there are many non-voice calls and few voice calls among the communication calls between the radio base station 1 and the exchange 3, the combined voice / non-voice line T6 can be used as a non-voice line. Voice data and non-voice data can be transmitted without lowering the utilization efficiency of the transmission path between the mobile station and the exchange. When there are few non-voice calls and many voice calls among the communication calls between the radio base station 1 and the exchange 3, voice calls are allocated to the radio equipment 20 and the radio equipment 21, and voice / non-voice Since the dual-purpose line T6 is used as a voice line, voice data and non-voice data can be transmitted without lowering the utilization efficiency of the transmission path between the radio base station and the switching center. In addition, a non-voice call is preferentially assigned to a specific wireless device terminating one wireless line,
According to the voice and non-voice traffic, the voice / non-voice shared line between the higher-level station (exchange station 3) can be selectively used as a voice line or a non-voice line, so that the traffic volume of the non-voice call can be reduced. In such a system, the number of allocated non-voice lines can be reduced to increase the number of allocated voice lines. Next, FIG. 6 is a diagram showing a second configuration of a frame subjected to time division multiplex communication on the transmission line a. In FIG. 6, time slots T1 to T4 are allocated as voice lines, time slots T5 and T6 are allocated as voice / non-voice lines, and time slots T7 and T4 are allocated.
8 is assigned as a non-voice line. Here, the wireless devices 10 and 11 in the wireless base station 1 are allocated to the voice line T1, and voice data of six channels including the channels of the wireless devices 10 and 11 can be transmitted. Similarly, the wireless base station 1 is connected to the voice lines T2 to T4.
Of the wireless devices 12 to 17 in each
17 audio data transmission. Further, radio equipments 18 to 21 in the radio base station 1 are allocated to the voice / non-voice combined lines T5 and T6,
Each of the wireless devices 18 to 21 can transmit voice data or non-voice data. Further, the wireless devices 18 to 21 are assigned to the non-voice lines T7 and T8, and each of the wireless devices 18 to
21 enables use when performing non-voice communication. FIG. 7 is a flowchart showing a second operation example of the mobile communication system shown in FIG. The operation of the main part of the mobile communication system will be described according to this flowchart and the frame configuration of FIG. In step S11 of FIG. 7, the control unit 22 of the wireless base station 1 determines whether or not there is a request for non-voice communication from the mobile station. Here, if there is a request for non-voice communication and the determination in step S11 is "Y", first, in step S12, it is determined whether or not there is an empty channel in the wireless device 21 allocated for non-voice calls. If there is a free channel in the wireless device 21 and the determination in step S12 is "Y", a non-voice line T8 on the transmission line a is assigned to the wireless device 21 in step S13, and the free channel and the transmission The communication of non-voice data is started via the non-voice line T8 on the road a. Here, when the channels of the wireless device 21 are vacant for the maximum three channels, “Y” of “non-voice call request?” In step S11 and “Y” of “wireless device 21?” In step S12. In response to "Y", non-voice calls for up to three channels are assigned to the wireless device 21 and the non-voice line T8. The wireless device 21 and the non-voice line T8
When there is a request for the next non-voice call to the wireless base station 1 during communication of non-voice data for three channels via the
Is “Y” in “No non-voice call request?” In step S11.
After "N" of "is wireless device 21 available?" In step S12, it is determined in step S14 whether or not there is an available channel in wireless device 20. If there is an empty channel in the wireless device 20, the wireless device 20 is allocated to the voice / non-voice line T6 in step S15. As a result, communication of non-voice data is started via the vacant channel of the wireless device 20 and the voice / non-voice combined line T6 on the transmission path a. On the other hand, if there is no free channel in the wireless device 20 and the determination in step S14 is “N”, the process proceeds to step S16 to determine whether the wireless device 19 has a free channel. If there is an empty channel in the wireless device 19, the wireless device 19 is connected to the non-voice line T in step S17.
Assign to 7. As a result, communication of non-voice data is started via the idle channel of the wireless device 19 and the non-voice line T7 on the transmission line a. If there is no free channel in the wireless device 19, the wireless device 18 is assigned to the voice / non-voice line T5 in step S18. As a result, communication of non-voice data is started via the vacant channel of the wireless device 18 and the voice / non-voice line T5 on the transmission line a. When a non-voice call is not assigned to any of the radio devices 18 to 21, the control unit 22 of the radio base station 1 transmits a voice / non-voice line T5 to the radio devices 18 to 21.
T6 is assigned and used, and voice communication is performed. Therefore, the combined voice / non-voice lines T5 and T6 can be used as voice or non-voice lines according to voice and non-voice traffic. As described above, in this embodiment, the transmission amount of a non-voice call can be doubled by adding one non-voice line. When a request for a voice call is issued from the mobile station, the control unit 22 of the wireless base station 1 sequentially allocates the wireless devices 10 to the wireless base station 17 in order to the voice lines T1 to T4. As described above, according to the present invention, one frame of data on a transmission path between a radio base station having a plurality of radio apparatuses and an exchange is divided into a plurality of time slot data. And allocates a plurality of time slots to any one of a voice line, a non-voice line, and a voice / non-voice line, and allocates the allocated voice line, non-voice line, and voice line. / A non-voice shared line is allocated to each wireless device of the wireless base station, and a voice / non-voice shared line is used for voice data communication or voice data in accordance with the respective traffic volumes of voice data and non-voice data.
Is used for either one of the non-voice data communication. If the non-voice line is full when new non-voice data is communicated, the voice / non-voice combined line is switched to the non-voice line. If the voice line is full when new voice data is communicated, the voice / non-voice combined line can be used as the voice line. When voice and non-voice data are communicated on a transmission path, the utilization efficiency of the transmission path is improved. In a system in which the traffic volume of a non-voice call is small, the number of allocated non-voice lines can be reduced and the number of allocated voice lines can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a mobile communication system to which the present invention has been applied. FIG. 2 is a diagram illustrating a first configuration of a frame that is subjected to time division multiplex communication on a transmission path between a radio base station and an exchange configuring a mobile communication system. FIG. 3 is a diagram showing a configuration of an audio line of the transmission line. FIG. 4 is a diagram showing a configuration of a non-voice line of the transmission line. FIG. 5 is a flowchart showing a first operation of the radio base station. FIG. 6 is a diagram showing a second configuration of a frame subjected to time division multiplex communication on the transmission path. FIG. 7 is a flowchart showing a second operation of the radio base station. FIG. 8 is a diagram showing a conventional configuration example of a frame subjected to time division multiplex communication on the transmission path. [Description of Signs] 1 ... Wireless base station, 3 ... Exchange station, 5 ... Mobile station, 7 ... Fixed network, 10-21 ... Wireless device, 30-36 ... Sound processing device.

Claims (1)

(57) [Claim 1] A mobile station, a radio base station having a plurality of radio apparatuses for performing radio communication with the mobile station, and connected to the radio base station via a transmission path. And a switching station that receives voice data and non-voice data received from the mobile station by the wireless device and transmitted through the transmission path, and converts the data into data used in a fixed network. Time-dividing the data of one frame into data of a plurality of time slots and communicating via each time slot; and a voice line capable of communicating voice data with the plurality of time slots and communication of non-voice data. Any one of a non-voice line capable of transmitting data and a voice / non-voice combined line capable of data communication of either voice data or non-voice data
Allocating the allocated voice line, non-voice line, and voice / non-voice line to each wireless device of the wireless base station, and the traffic volume of voice data and non-voice data, respectively. line allocation method for a mobile communication system, characterized by a step of using said speech / non-speech combined line to one of communication of the communication of the communication or non-voice data of the voice data in accordance with the.